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Obsidian (Wikipedia) Obsidian (/əbˈsɪdi.ən, ɒb-/ əb-SID-ee-ən ob-) is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock.
Everyone has duties to the community in which alone the free and full development of his personality is possible.
Everyone has the right to the protection of the moral and material interests resulting from any scientific, literary or artistic production of which he is the author.